MAX3814 데이터 시트보기 (PDF) - Maxim Integrated
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MAX3814 Datasheet PDF : 14 Pages
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DVI/HDMI TMDS FR-4 and
Cable Equalizer/Driver
Laptop PC TMDS Equalizer and Driver
As shown at location XX in Figure 6b, the MAX3814
equalizes trace losses and redrives the TMDS outputs
at the docking connector. The 200Ω resistor at the out-
put of the MAX3814 absorbs reflections from the dock-
ing connector.
Dock or Port Expander
The MAX3814 can also be used on the dock or port
expander as it equalizes loss, isolates the connector,
and redrives TMDS output signals at location YY as
shown in Figure 6b. Similarly, with the previous applica-
tion, the 200Ω resistor at the output of the MAX3814
absorbs reflections in this case from the DVI or the
HDMI connector.
An optional 2dB to 6dB attenuator pad can be used to
absorb reflections between internal interface connec-
tions. If used, the attenuator pad must be a matched Pi
or T attenuator network. The resulting flat through loss
can be made by the excellent input sensitivity of the
MAX3814 as shown in the Typical Application Circuits.
The MAX3814’s excellent input sensitivity allows the
attenuated signal to be restored.
GRAPHICS
BOARD
ASIC
LAPTOP
DOCK
EXTERNAL DVI/HDMI
CABLE
REMOTE DISPLAY
50Ω
3.3V
ASIC
MXM
CONNECTOR
DOCKING
CONNECTOR
INTERNAL
CONNECTOR
OR FLEX
50Ω
3.3V
DVI/HDMI
CONNECTOR
DVI/HDMI
CONNECTOR
AB
C
REFLECTION
INTERFACES
GRAPHICS
BOARD
ASIC
LAPTOP
XX
MAX3814
50Ω
3.3V
D
200Ω
PAD
E
DOCK
YY
MAX3814
50Ω
3.3V
200Ω
F
EXTERNAL DVI/HDMI
CABLE
G
H
REMOTE DISPLAY
ZZ
MAX3814
50Ω
3.3V
200Ω
50Ω
3.3V
ASIC
50Ω
50Ω
3.3V
3.3V
50Ω
50Ω
3.3V
3.3V
MXM
CONNECTOR
DOCKING
CONNECTOR
INTERNAL
CONNECTOR
OR FLEX
DVI/HDMI
DVI/HDMI
CONNECTOR CONNECTOR
Figure 6a (top). Schematic Showing the TMDS Signal Channel from the Laptop Graphics Boards to the Remote Display. Possible
Reflection Interfaces are Labeled A to H.
Figure 6b (bottom). Schematic Showing the Same Channel, with possible location of the MAX3814 to Equalize Losses, to Absorb
Reflections, and to Redrive the Transmission Line.
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